Siemens TIASTAR Руководство по эксплуатации - Страница 12
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Reversible bottom end-cover plates cover the bottom horizon-
tal wireway, ground bus opening, and the end channels. They
perform this function if the section is mounted on its sills, or if
the section with sills is grouted into the floor, the plates are
simply rotated 180°. See Figure 9.
If the control center is located on structural steel platforms
over grids, it is recommended that the center be modified with
bottom plates.
Note: To comply with NEC 380-8(a) Height Requirements, the
customer should ascertain that the operating personnel.s
working base is at the same level as the MCC base.
3.5 Top and Bottom Covers
Top covers are provided on all motor control centers as an inte-
gral part of the enclosure. Bottom covers are supplied on cer-
tain types of construction such as NEMA 12. These covers
should be removed only for the purpose of piercing holes for
Figure 7 -
conduit or wire entry and must be immediately replaced to
Grouting Method of Fastening Motor Control Center
reduce the possibility that falling material, tools, or personnel
could unintentionally contact the bus system or other live
parts.
Figure 8 - Welded Installation
Figure 9- Reversible bottom end-cover plates
12
Siemens Energy & Automation, Inc.